Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 The force acting on a charge moving in a magnetic field is perpendicular to the both magnetic field and direction of motion is proportional to the magnetic of charges vanishes when the motion is directly opposite to the direction of field all of the above
2 'K' is the proportionality constant of force experienced by conductor. What is the value of 'K' in SI units? 0 1 0.5 -1
3 A current carrying conductor is placed at right angle to the magnetic field. The magnetic force experienced by the conductor is minimum maximum zero none of these
4 In a straight current carrying conductor, the direction of magnetic field can be found by right hand rule left hand rule head to tall rule none of these
5 The direction of lines of force depends upon the direction of voltage current charges none of these
6 The most suitable material for permanent magnet is cobalt iron steel alaminium
7 The field around a moving charge is called magnetic field conservative field non-conservative field none of these
8 The sources of magnetic field are isolated magnetic poles charges at rest charges in motion none of these
9 Heating effect caused by an electric circuit is written H = I<sup>2</sup>Rt H = I<sup>2</sup>R H = IR<sup>2</sup>t H = IR<sup>2</sup>
10 Electric generators which convert mechanical energy into solar energy thermal energy kinetic energy electrical energy
11 Solar cell converts sunlight directly into potential energy thermal energy mechanical energy electrical energy
12 If a 40 watt light bulb burns for 2 hours. how much heat is generated 288 x 10<sup>3</sup>J 288 x 10<sup>8</sup>J 288 x 10<sup>5</sup>J 288 x 10<sup>6</sup>J
13 The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of power current resistance temperature
14 The speed of randomly moving electrons depends upon pressure volume temperature mass
15 The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of negative charges positive charges protons electrons
16 The charge carriers in gases are electrons ions protons ions and electrons
17 The charge carriers in electrolyte are positive and negative protons electrons ions none of these
18 The relation between charge 'Q' and current 'I' is given by Q = I/t Q = It Q = I<sup>2</sup>t Q = I<sup>2</sup>/t
19 Which of the following represents an electric current? C<sup>-1</sup> CS<sup>-1</sup> J.S<sup>-1</sup> dynes<sup>-1</sup>
20 The SI unit of current is watt coulomb volt ampere
21 One coulomb per second is equal to One volt One ampere One hom One henry
22 The charge per unit time through any cross-section of a conductor is called capacitance electric power current potential difference
23 Free electrons are tightly bound fixed loosely bound tightly fixed
24 The current through a metallic conductor is due to the motion of protons neutrons electrons free electrons
25 In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called Time constant Decay constant None of these All of above
26 Capacitance of two or more capacitors Increases in series combination Increases in parallel combination Remains unchanged None of the above
27 The electric intensity at infinite distance from the point charge will be Infinite Positive Zero Negative
28 The electric intensity outside the two oppositely charged parallel metal plates is Maximum Minimum Zero Infinite
29 The energy stored in a charge capacitor 1/2CV<sup>2</sup> 1/2C<sup>2</sup>V 1/2C/V<sup>2</sup> None of these
30 In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes Four-fold One-half One-fourth Zero
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